全文获取类型
收费全文 | 1242篇 |
免费 | 81篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 41篇 |
妇产科学 | 10篇 |
基础医学 | 120篇 |
口腔科学 | 14篇 |
临床医学 | 110篇 |
内科学 | 333篇 |
皮肤病学 | 2篇 |
神经病学 | 82篇 |
特种医学 | 318篇 |
外科学 | 66篇 |
综合类 | 22篇 |
一般理论 | 4篇 |
预防医学 | 126篇 |
眼科学 | 7篇 |
药学 | 62篇 |
中国医学 | 1篇 |
肿瘤学 | 26篇 |
出版年
2021年 | 15篇 |
2018年 | 21篇 |
2017年 | 12篇 |
2015年 | 18篇 |
2014年 | 19篇 |
2013年 | 14篇 |
2012年 | 30篇 |
2011年 | 29篇 |
2010年 | 19篇 |
2009年 | 30篇 |
2008年 | 24篇 |
2007年 | 53篇 |
2006年 | 32篇 |
2005年 | 29篇 |
2004年 | 22篇 |
2003年 | 16篇 |
2002年 | 23篇 |
2001年 | 12篇 |
2000年 | 16篇 |
1999年 | 26篇 |
1998年 | 49篇 |
1997年 | 40篇 |
1996年 | 63篇 |
1995年 | 47篇 |
1994年 | 41篇 |
1993年 | 42篇 |
1992年 | 21篇 |
1991年 | 23篇 |
1990年 | 24篇 |
1989年 | 37篇 |
1988年 | 45篇 |
1987年 | 37篇 |
1986年 | 33篇 |
1985年 | 46篇 |
1984年 | 23篇 |
1983年 | 26篇 |
1982年 | 27篇 |
1981年 | 27篇 |
1980年 | 16篇 |
1979年 | 9篇 |
1978年 | 17篇 |
1977年 | 35篇 |
1976年 | 20篇 |
1975年 | 23篇 |
1973年 | 9篇 |
1972年 | 11篇 |
1969年 | 12篇 |
1968年 | 11篇 |
1967年 | 7篇 |
1966年 | 7篇 |
排序方式: 共有1345条查询结果,搜索用时 16 毫秒
1.
Elizabeth A. Mosley PhD MPH Amy J. Schulz PhD MPH MSW Lisa H. Harris MD PhD Barbara A. Anderson PhD 《Women & health》2020,60(7):806-820
ABSTRACT Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood. 相似文献
2.
J.W. Mosley 《Vox sanguinis》1994,67(S4):12-15
Hepatitis A virus (HAV) infection occurred after administration of factor VIII concentrate in Europe associated with one manufacturing process. We determined if there was an excess prevalence of anti-HAV among hemophiliacs in the United States, and whether any infections here were potentially concentrate-associated. We observed clotting disorder patients and household members for up to 7 years at 6-month intervals. Selected specimens were titered for anti-HAV-immunoglobulin G content to distinguish whether they were passively or actively acquired. Our results show that anti-HAV prevalence was 20–25%, but males with clotting deficiencies had a 44% rate (p < 0.001). Passive anti-HAV (≥ 30 to < 950 mIU/ml) from intermediate-purity factor VIII may have protected against community HAV exposure. Factor IX concentrates, which contain no anti-HAV, did not protect and a few instances of past transmission are possible. Criteria for present-day concentrate-associated cases were developed; no subject conclusively met these criteria during the period between late 1985 and May 1993. In conclusion, the excess of anti-HAV prevalence in male clotting disorders is attributable to both passive administration in concentrate, and past therapy prior to concentrates. No untoward HAV event related to concentrate was found in our population, but measures to prevent transmission of nonenveloped viruses should be instituted. 相似文献
3.
4.
5.
A randomized controlled trial of electromagnetic therapy in the primary care management of venous leg ulceration 总被引:1,自引:1,他引:0
OBJECTIVE: The aim was to establish the potential efficacy, tolerabilityand side-effect profile of electromagnetic therapy as an adjunctto conventional dressings in the treatment of venous leg ulcers. METHOD: A prospective, randomized, double blind controlled clinicaltrial was carried out in a dedicated leg ulcer clinic basedin one urban general practice. Nineteen patients with leg ulcersof confirmed venous aetiology were assessed. The main outcomemeasures were rate and scale of venous leg ulcer healing, changesin patient-reported pain levels, quality of life, degree ofmobility, side effect profile and acceptability to patientsand staff. RESULTS: Sixty-eight per cent of patients attending this dedicated clinicachieved improvements in the size of their ulcer (4, 21%, healedfully) and in reduced pain levels (P < 0.05) during the trial,despite the chronicity of ulcer histories. Patients treatedwith electromagnetic therapy at 800 Hz were found at day 50to have significantly greater healing (P < 0.05) and paincontrol (P < 0.05) than placebo therapy or treatment with600 Hz. All patients reported improved mobility at the end ofthe study. The electromagnetic therapy was well tolerated bypatients, with no differences between groups in reporting adverseevents, and proved acceptable to staff. CONCLUSION: Despite the small numbers in this pilot study, electromagnetictherapy provided significant gains in the healing of venousleg ulcers and reduction in pain. Keywords. Electromagnetic therapy, RCT, leg ulcers, primary care. 相似文献
6.
7.
8.
9.
10.
Antonio C. Buzaid David S. Alberts Janine Eispahr Kurt Mosley Yei-Mei Peng Kendra Tutsch Collin P. Spears Harinder S. Garewal 《Cancer chemotherapy and pharmacology》1989,25(2):124-130
Summary Dipyridamole (DP) has previously been studied both in vitro and in vivo in combination with various antimetabolites, including methotrexate and 5-fluorouracil (5FU). We evaluated in vitro and clinically the effects of adding DP to fluorodeoxyuridine (FUDR) in colorectal cancer. Using a human colony-forming assay, we observed that 0.05 M DP increased the cytotoxicity of FUDR by a median of 33.5-fold vs 1.5-fold for 5FU against human colon-cancer cell lines. The mechanism of the DP-enhanced antitumor activity of FUDR is not completely understood but appears to be related to a profound inhibition by DP of thymidine accumulation in and FUDR efflux from colon-cancer cell lines. On the basis of these in vitro results, 28 patients with metastatic colon cancer were entered in a clinical trial of monthly courses of 0.1 mg/kg FUDR daily for 14 days and 75 mg oral DP 5 times daily for 14 days starting on the 3rd day of continuous i.v. FUDR infusion. The pharmacokinetics of DP was studied in three patients; the results showed that 98% of total serum DP was protein-bound and that free DP levels were significantly lower than the concentrations necessary for the expected in vitro DP/FUDR modulation. Treatment was well tolerated, with only 12 patients developing mild to moderate toxicity. Of 27 evaluable patients, 4 achieved a partial response that lasted 2, 3, 5, and 6+ months. This relatively low response rate (15%), which is similar to that achieved with FUDR alone, may be explained by the low steady-state plasma concentrations of free DP achieved in our patients. Other means of DP administration, such as i.v., i.a., and i.p. injection, may be required to achieve free DP concentrations necessary for successful biochemical modulation of FUDR in patients.Supported in part by grants CA17094, CA23074, and CA39629 from the National Institutes of Health, Bethesda, Md 20205, and a grant from the Arizona Chronic Disease Commission. HSG is a recipient of an American Cancer Society Career Development Award 相似文献